Drilling-machine.



J. A. EDEN, JR.

DRILUNG MACHINE.

APPucAnou mm SEPT- 14. I914.

- Patented Nov. 2, 1915.

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.l. A. EDEN, la.

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APPLLCATION FILED SEPT- 14. I914.

- Patented Nov. 2, 1915.

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1. A. EDEN, 1R.

7 DRILLING MACHINE. APPLICATION FILED SEPT. 14, 19M. 1 159 196, Patented Nov. 2, 1915.

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I6 'WITIVESSES' APPLICATION FILED SEPT. 1.4, 1.914.

' JQA. 505mm.

DRILLING MACHINE. E

" Patented Nov. 2; 1915.

9 SHEETS-SHEET 5.

INVENTOR ATTORNEY J. A. EDEN, JR.

DRILLING MACHINE.

APPU CATION FILED SEPT. 14. I914.

Patented Nov. 2, 1915.

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APPLICATION FILED SEPT-14,1914. I v

Patented Nov. 2, 1915.

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DRILLING MACHINE.

APPLICATION [FILED SEPT. 14. 1914.

Patented Nov. 2, 1915.

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wmmn'l WITNESSES WENT-0R. WWW/y \7w WeJJJ6 mI By v ATTORNEY J. A. EDEN, 1R. DRILLING MACHINE.

' APPLICATION H LE!) SEPT. 14, I914.

Patehted Nov. 2 1915.

\ ITIVE88E8" INVENTOR.

Jar mes ,1, fr

JAMES A. EDEN, JR., or SPRINGFIELD, MASSACHUSETTS.

DRILLING MACHINE.

Specification of Letters Patent.

Patented Nov. 2, 1915.

Application filed September 14, 1914. Serial No. 861,591.

' To all whom it may concern:

- ,Be it known that I, JAMES A. EDEN, Jr., a citizen of the United States, residing in Springfield, Massachusetts, have invented certain new and useful Improvements in Drilling-Machines, ofwhich the following is a specification.

This invention aims to provide a machine of the style called Semi-automatic in which the work is placed in the machine by hand and is thereafter automatically handled and dles for drilling, counterboring, tapping or from that in another head. The work is automatically drilled by one after the other of these groups of drills. There are several advantages in doing the work 1n this way instead of drilling all the holes at once by means of. a large number of drills. These advantages arise in special cases in which there is a variation inthe size of the holes to be drilled. This permits the use of more powerful gearing, driving a smaller number of spindles, in the head which drills the larger holes and a greaternumber of smaller spindles, each driven by less powerful gearing, in another head; thusproviding an e en distribution-of the work on the several spindles in each head'and on the'several heads in the machine. In some cases also the holes to be drilled are so close together that it is difficult or impossible to bring two spindles close enough together for simultaneously drilling both holes. Also in some cases the locations of the holes are such that they can not be reached by the ordinary multiple arm machine, the arm supporting the outer spindle would block that which would be necessary for the inner spindle; and if a fixed center geared head were used for this class of work there would be di-fliculty in driving the outer spindles owing to interference by the gearing for driving the inner Spindles. Owin to these diiiiculties the drilling of holes 1n work of these sorts has been comparatively slow and laborious.

' The present invention provides a machine which will take any class of work, witl the holes to be drilled varying greatly in size and located in the most irregular and diflicult positions, and will drill such plates with comparative rapidity and with no eflort on the part of the workmen except that required for lifting the completed plate out of the machine and introducing a new plate. For example, the particular machine illustrated, having five drilling heads, is deslgned to drill a plate which has heretofore been drilled by means of twelve different machines.

The accompanying drawings illustrate embodiments of the invention.

Figure 1 is a plan of the complete machine; Fig. 1 is a plan of part of the gear- 1ng; Fig. 2 is a side elevation thereof partly broken away to'show one of the heads and the gearing therefor; Fig. 3 is a vertical sectional view of one of the heads and the lower part of the gearing therefor, this section being indicated in Fig. 1 by the line 3-3; Fig. 4 is a similar view of the upper part of the gearing for one of the heads, bemg In fact an upward continuation of Fig. 3; Fig. 5 is a sectional view on the line 55 of Fig. 1; Fig. 6 is a section on the line 66 of Fig. 1; Fig. 7 is a horizontal section. on the line 77 of Fig. 3; Fig. 8 is a plan of the lower gearing with the rotatable bed removed; Fig. 9 is a horizontal section of the same on, the line 99 of Fig. 2; Fig. 10 is a vertical sectional view of the Geneva movement shown in Fig. 9; Fig. 11 is a de- Y line 12-12, Fig. 8; Fig. 13 is a vertical section of a hand-operating lever and connections; Fig. 14: is a perspective View of a multiple spindle head of ordinary type which may be substituted for that shown in the previous figures; Fig. 15 is a plan of a piece of workdone by the machine; Fig. 16 is a section on the line 16-16 of Fig. 8; Fig. 17 is a view similar to Fig. 10 of a modified style of Geneva movement.

Referring to the embodiment of the invention illustrated, the horizontal bed A has a step by step rotary movement about a central axis, stopping at six successive angular positions and having six work holding plates B upon which the work C'is set. The plates B serve to locate the work and where the work is a circular plate with a central opening as in the present machine a central pin D (Fig. 3) is provided for passing throughthe opening in the work and an outer pin E near the edge for determining ward against holding mounted on each of in cooperation with a marked point on the work the 'proper angular position of the work. Various styles of carrying plate may be used according to the shape of the work piece. At five of the stations at which the work C stops there are located drill heads F carrying a number of spindles G adapted for attachment at their lower ends in the usual way to drills and similar tools, the spindles G being driven by any usual or suitable arrangement of gearing within the head operated from a central gear H WlllCll is keyed on a shaft J extendingupward through the drill head. Ea'ch drill head also carries preferably a jig plate .L supported by three rods M and adapted, when the head is lowered, to engage the work and be pressed upthe action of spiral springs N be ring on collars on the supporting rods. For locating the jig accurately on the work, it may be provided with suitable means engaging the holding plate B, such for example, as a central pin 0 fitting in a recess in the upper end'of the central pin D of the plate and a projection P engaging a notched member Q, at the inner edge of the locating plate.

Atthe upper end of the stem K is a gear casing R with a cover S which can be opened when gearing of a different rate is to be substituted, this gear casing being extended upward in a stem T so that the parts K and T constitute practically extensions of one another. They are arranged to slide in bearing brackets U and V which are mounted on a central casing W su ported from above. This casing, see Fig. 7, is substantially hexagonal and carries five counterweights X for the five drill heads, one being five faces of the casing, the sixth face being blank and representing the point of discharge and feed of the work.

The counterweights work with a multiply-- ing leverage on their several drill heads,

' each counterweight carrying a cable Y runmng up over a guide pulley Z, Fig. 3, to a a and groove 0. of larger diameter on a drum 6 having its end fastened in said groove; whereas the cable 0 from the drill head runs over a guide pulley d to a smaller groove in the drum e which is fastened to the drum f), the end of the cable being also fastened 1n its groove.

The central casing W is supported at its upper end from the base plate f of a casing g at the top of the machine, the latter being supported by columns 7:. extendingdown to thebase j. The stem T of the drill head is provided with an extension is, 'Figs. 2 and 4, wh ch passes up into the upper casing g and 1s guided at its upper end in a bracket Z, the intermediate part of this extension or rod is carrying a cam roller m lying in the groove 01. of a cam o mounted on a drum the hollow supporting stem K' of work'and introduce new pieces.

memes p on hollow shafts Q and q, said drum having one-end bearing against a roller 1' whichk on their lower end held down by hollow nuts 7: screwed down to a fixed point in the ends of the stems T. The upper shaft q of the feed cam carries at its end a pinion s engaging a gear t which is rotatably mounted and is driven by means of a pinion u on ashaft 'v at the upper end of which is a worm wheel w driven by a worm 00, Figs. 1 and 1. This worm is mounted on a shaft ycarried in a bearing y (Fig. 2) which is p'votally supported so that it can be swung gear-- .2, Fig. 6, which meshes with a gear 9. on the end of a shaft 3 which carries at its opposite end a gear 4 meshing with a pinion 5, Fgs. 1 and 1, on the shaft6 of the motor When a drilling operation is taking place the worm w is in engagement With the worm gear w and the rotation of this gear drives toward and away from the worm gear w; i the shaft y carrying at its opposite end a the cams 0 which feed the drills to and 7 through the work and thereafter lifts them.

The shaft 4) of the worm gear is eccentric to the machine as shown in Fig. 1.' Its pinion to, however, drives the gear t which is located on the central axis of the machine and this in turn drives the pinions s and cam shafts Q of the five drill heads.

When, in an emergency, it is desirable to stop the feed of the spindles quickly this may be done by swinging the shaft 3/ of the gear 'to the right so as to disengage the Worm from the wheel which it drives and also to disengage'the pinion z from the gear 2 by which. it is driven. For this purpose the shaft 3 is mounted in a bearing g which is pivotally supported and connected (Figs. 1 and 2) to a link 8 connected to the end of an arm 9 on a horizontal shaft 10 at the outer end of which is an arm 11 connected by a vertical. depending link 12 to a hand lever 13 mounted on the base of the machine adjacent to the point at which the operator stands to withdraw the finished A detail of the hand lever is shown in Fig. 11 with a spring lock 14 attached to enter notches in a fixed plate 15 so as to hold the lever in elther position in which it. is set and to hold the feed-operating worm in the operative or in the inoperative Position.

The motor shaft 3 drives any usual or suitable oil feeding ump by means of a pulley on the end of t e shaft driving abel t 16 which drives a pulley on the end of a shaft 17 at the opposite end of which is a pulley driving a belt l8 through which motion is transmitted to the oil pump 19. In Fig. 1 a supplementary casing over the central gears and the worm gearing has been removed to show these more clearly, and in Fig. 2 this casing-20 is partly broken away.

I The rotation of the shaft J (Fig. 3) which drives the several spindles in each head is effected through a gear 21 on its upper end engaging a pinion 22 mounted in bearings in the casing R and splined on a shaft 23 so that it will be continually rotated by this shaft as the casing R is moved up or down to feed the spindles to the work. The shafts 23, one for. each of the five drill heads, pass upward through bearing blocks 24 mounted in the base 7 of the upper casing 0 and extend through thecain drum p and through th hollow spindle 9 thereof and are adapted to rotate relatively thereto, a ball bearing 25 being preferably interposed between the spindle of the drum and the hub of a pinion 26 on the upper end of'the shaft 23 and by which the latter is driven. The several pinions 26 are all driven from a central gear 27 which is keyed on a hollow shaft 28 carrying at its upper end a beveled gear 29 engaging a beveled pinion 30 mounted on the shaft 3 Which is driven from the motor as above described.- From the base f of the upper casing a hollow standard 31 extends upward and carries the shaft 32 of the central gear t which operates the feed for the several drill heads through the pinions s. The gears t and 27 are separated from each other by a ball bearing 33. The upper end of the shaft 32 is mounted in an intermediate bearing 34 of the main driving shaft 3, the latter being carried in a bearing 35 (Fig. 4) at the end nearest the motor and a bearing 35 (Figs. 1 and 6) at the opposite end.

The bed A is rotated with an intermittent movement by means of a Geneva. stop motion. The power is communicated from. overhead by means of ashaft 36 (Figsal, 2

and 5) mounted in bearings above and below and carrying atits upper end a pinion 37 driven by a gear 38 mounted on a bearing projecting upward from the base f of the upper casing and driven by one of the pinions 8 which operate the feed of the spindles. Fig. 1 illustrates the transmission from the worm w to the several feed-o eraing gears s and to the shaft 36 which urus. thebed carrying the work.- The lower end of the shaft 36 is mounted in a cylindrical bearing 39 projecting upward from the base 3'. A pinion 40 on the lower end of the shaft drives a gear 41 (Figs. 8, 9 and 13) mounted on a short vertical shaft 42 below the bed of the machine which carries at its lower end a plate 43 carrying an arm or crank 44 on the end of which is a roller 45 operating in the four radial grooves 46 which are formed on the underside of the star wheel 47 (Figs. 9 and 10.) also mounted on a short shaft 48 beneath the bed of the machine, said shaft 48 carrying at its upper end a pinion 49 Which drives a gear 50 (Figs. 8 and 12) which is mounted as an annular flange on the underside of the bed A. The bed is supported by an edge. bearing upon the fixed base, and at the center upon a fixed post 51 through which extends a bearing pin 52 attached to and rotating with the bed. As the shaft 36 is driven, therefore, the pinion 40 on its lower end drives the gear 41 which in turn operates the arm 44 which turns the Geneva wheel 47 and the gear 49, which in turn rotates the gear 50, and the bed. The purpose of the Geneva movement is to secure a very gradual start with an increased intermediate speed and a gradual stop, such a motionbeing important with parts of the.

weight here in question. As the roller 45 enters the slot 46 it is moving parallel withthe direction of the slot. Similarly in leaving the slot the roller is moving in the same direction. At these two points, therefore,

the maximum length of travel of the roller.

in the slot, thus securing to the greatest extent the desired powerful and graduated movement. The gear 49 on the Geneva wheel shaft 48 isrotated a quarter of a revolution at each operation and is so proportioned to the gear 50 on the bedas to rotate the latter a sixth of a revolution at each operation. I

The bed is locked in its successive operative positions by means of a spring bolt 53 mounted on the fixed base j and adapted to v enter notches54 provided in blocks 55 arranged at six equal intervals on the underside of the bed. The bolt 53 is pivotally connected by a depending pivot'to an arm 56 (Fig. 16) of a bent lever which is mounted on the base 7' and the other arm 57 of withdraws the bolt so as to allow the bed to turn. The star wheel then continues to turn the bed until the operating roller esa ball bearing 60 upon a block 61 which carrics trunnions62 at the sides resting in slots in a fork 63 constituting the short end of a lever 64 which is pivoted at (35. The lever 4 extends (Figs. 8 and 16) to a point under the plate 43 carrying the operating arm of the Geneva movement and is provided at its outer end with a cam roller 65* bearing on the underside of a cam 66 arranged below the edge of the plate 43, which carries the roller that operates the star wheel and in the same angular position as the cam 59 which unlocks the bed; so that as the roller of the Geneva movement enters its slot the bed is unlocked and also lifted a minute distance and supported on the ball bearing 60, so that its movement is eased while the Geneva wheel is being turned, after which it is lowered again onto the fiat steady bearings on which it rests while the work is being done.

In setting up the machine, inserting the desired drills and locating them it is desirable to be able to turn the bed very slowly by hand, and means are provided for this purpose. The shaft 36 which drives the train of gears including the Geneva movement carries (Figs. 2 and 13) a pinion 67 adapted to be engaged by a tooth 68 carried on a lever 69 which is pivotally mounted on a sleeve 70 rotatably mounted on the shaft 36. Vhen the lever 69 is raised the tooth 8 will engage the pinion 67 and the operator can turn the shaft slowly, dropping the lever and turning it back to the starting point at intervals so that by an intermittent operation of the lever he can turn the shaft 36 and the bed carrying the work. When the lever 69 is dropped it rests in looking notches in an arm 71 of the sleeve 70 and an arm 72 projecting from the lower bearing 39 which is fixed on the base of the machine.

The gearing below the bed is generally covered by a casing 73, the outline of which is shown in dotted lines in Fig. 2.

The drill heads are. supported detachably from the stem K so that whenever it is desired a head carrying a new arrangement of spindles may be substituted; As'shown in Fig. 3, for example, the head F is supported from the lower end of the stem K by means of a ring F bearing on a shoulder F at the base of the stem and projecting beyond such shoulder and fastened by bolts F to the head F, the latter fitting around the base of the stem K. Upon withdrawing the bolts 1 the head F with its several spindles and corresponding gearing may be withdrawn and another head applied to the lower end of the driving shaft J and fastened by means of bolts F In place of the drill heads shown in the previously described figures I may substitute drill heads with other combinations of spindles according to the work which is to be done. Or I may use for one or more of these heads a multiple spindle head in which the spindles are adjustable to various positions. A head of this class, for example, is shown at F in Fig. 14, the spindles G being carried in the inner ends of arms F which can be adjusted radially and angularly so as to secure any one of a great variety of combinations.-

A plan of a piece of work done with the machine of Figs. 1 to 13 is illustrated in Fig. 15, being a circular plate containing holes in the variety of positions and of a variety of sizes. The circular plate C (usually formed with raised ribs in various lines which are omitted here for the sake of clearness) is first drilled to form twentyseven holes 74. At the second operation the three holes 75 and the three holes 76 are drilled. At the third operation the holes 75 are counterbored. At the fourth operation the same holes are reamed. At the fifth operation the six holes 77 are drilled. At the sixth station of the machine, as explained above, the work piece is withdrawn and a new one substituted.

With the train ofgearing shown, the bed is advanced during one-fourth of the rotation of the shaft 42 which drives theroller which actuates the star wheel. The period of rest therefore is three times as long as the period of transmission from one station to the next. If it be desired to secure a comparatively longer period of rest for the work, so that the period of transmission would bear a smaller ratio to the period during which the drilling operations are being performed, this could be done by bringing the star wheel 47 and the roller 45 into engagement with each other not at every revolution of the shaft 42, but at every second or third revolution thereof. This would cut down the time of transition from one station to the next to one-half or one-third of that employed with the gearing illustrated.' The engagement and disengagement of the star wheel and roller may be secured by carrying the roller around in a lower plane so that it shall pass below the star wheel, and lifting it into engagement with passing up into the shaft 48.

- should rotate correspondingly faster.

the star wheel during each second or third revolution; or the star wheel might similarly be lifted out of the plane of the roller and lowered into such plane only at desired intervals. Such an arrangement is shown in Fig. 17. The shaft 42 of the Geneva crank 44, rotating at a fixed height, carries at its lower end a pinion 78 engaging a gear 79 of twice its diameter carrying a cam 80 engaging the lower end of a lifting pin 81 The lifting pin has at its upper end a cross key 82 working in a vertical slot 83 in the shaft and fastened at its ends in the hub of the star wheel 46 which is free to move up and down on the shaft 48. the Geneva crank the cam 80 lying upon onehalf of the gear 79 will hold the star wheel up out of engagement; while on the alternate rotations of the crank the star wheel will be dropped into engagement and a horizontal feed of the work will take place. \Vith the movement of Fig. 10, one-fourth of the time is occupied in feeding the work and three-fourths in drilling; with that of Fig. 17 seven-eighths of the time is devoted to drilling. With the machine using the compounded intermittent movement of Fig. 17 therefore the machine can. be speeded up so as to rotate the bed faster while giving the same length of time for each drilling operation as with the movement of Fig. 10. To make a cycle of the machine in the same time the shaft 42 of the Geneva crank should rotatetwice as fast as for Fig. 10; and to increase the speed of a cycle the shaftr i112 gearing 78, 79 can be made in any desired ratio to cause the actuation of the star once for any desired number of rotations of the crank. Such a method secures all the advantages of extreme graduation of the speed and of leverage of the operating roller which are characteristic of a four-slot starwheel with the restriction of the time of operation of the star wheel to less than onefourth of that of the crank. The several. mechanical movements described and especially this compound Geneva movement may be used to advantage not only with machines for drilling as described but also with machines for other classes of work; the lessening of the time for shifting the work-piece compared with the time of actual work thereon, and the consequent lessening of the total time required for a cycle. of operations, being of great importance in the saving of labor.

All the Work-pieces on the bed of the machine are being worked upon at the same time, so that at each step of the machine a finished plate is turned out. The machine has therefore a very large output per hour although in size it is much smaller than the combinations of separate machines previ- During one revolution of ously used for doing the same classes of work. The jig for each set of drills is applied to and removed from the work auto? matically and without loss of time whereas a very considerable consumption of time for this purpose hasbeen common in previous methods of doing thisclass of Work.

Though I have described with great particularity of detail certain specific embodiments of my invention, yet it is not to be understood therefrom that the invention is restricted to the particular embodiments disclosed. Various modifications thereof in detail and in the arrangement and combination of the parts may be made by those-skilled in the art without departure from the invention as defined in the appended claims;

What I claim is 1. A machine of the class described including in combination a plurality of differing groups of spindles, means for operating all said spind es simultaneously from a common motor and means for automatically conveying a number of pieces of work simultaneously to successively advanced positions in line with the successive groups of spindles, so as to turn out after each conveying movement a piece of work which has. been gfilled by means of all the groups of spin- 2. A machine of the class described including in combination a plurality of multiple-drill heads, each carrying a different group of spindles, said heads'being detachable to permit the substitution of other groups of spindles, means for'operating all movement a piece of Work which has been (tifilled by means of all thegroups of spin- 3. A machine of the, class described including in combination a plurality of differing groups of spindles, means for operating all said spindles simultaneously from a common motor and means for automatically conveying the work from one group to another, said groups being arranged in a circle and said conveying means comprising an intermittently actuated rotary work carrier adapted to carry simultaneously a number of pieces of work, each in line with one of the groups of spindles so as to turn out after each conveying movement a piece of work which has been drilledby means of all the groups of spindles.

4. A machine of the class described including in combination a plurality of differgroups of spindles, means for operating all said spindles simultaneously from a common motor and means for automatically conveying the work from one group to another,

' cluding in combination a plurality of difiering groups of spindles, means for operating all said spindles simultaneously from a common motor and means for automatically conveying the work from one group to another, so as to turn out at each operation of the machine a piece of work which has been drilled by means of all the groups of spin dles, said groups being arranged in a clrcle and said conveying means comprising 'an intermittently actuated rotary work carrier, and means for applying ball bearings to said carrier while it is being advanced and removing said bearings during operating positions.

6. A machine of the class described in cluding in combination a.plurality of diifering groups of spindles, means for operating all said spindles simultaneously from a common motor and'means for automatically conveying the work from one group to another said groups being arranged in a circle an said conveying means comprising an intermittently actuated rotary work carrier adapted to carry simultaneously a number of pieces of work, each 1n line with one of the groups of spindles so as to turn out after each conveying movement a piece of work which has been drilled by meansvof all the groups of spindles, a lock for holding said carrier in operating position and a cam and sprin for operating said lock.

7. g machine of the class described including in combination a plurality of difi'ering groups of spindles, means for operating all said spindles simultaneously from a common motor and means for automatically conveying a number of pieces of work simultaneously to successively advanced positions in line with thrv successive groups of spindles, so as to turn out after each conveying movement a piece of work which has been drilled by means of all the groups of spindles, and jigs cooperating with the respective groups of spindles and all applied simultaneously to the respective work pieces.

' 8. A machine of the class described including in combination a plurality of dili'ering groups of spindles, means for operating all said spindles simultaneously from a common motor and means for automatically conveying the work from one group to another, so

as to turn out at each operation of the machine a piece of work which has been drilled by means of all the groups of spindles, each group of spindles being carried in a head which is movable toward and away from the Work, and jigs, one carried by-each of said heads and applied to the work by the movement of its head.

9. A machine ofthe class described including in combination a plurality of difi'ering groups of spindles,'means for operating all said spindles simultaneously from a common motor and means for automatically conveying the work from one group to another, said groups being arranged in a circle and said conveying means comprising an intermittently actuated rotary work carrier and a number of work-holding plates located at intervals around said work carrier and in line withsaid' groups of spindles, so as to turn out after each conveying movement a piece of Work which has been drilled by means of all the groups of spindles.

10. A machine of the class described including in combination a machine having a plurality of stations located at intervals in a circle so as to hold a number of pieces of work, means for automatically feeding all such pieces of work simultaneously and intermittently around from station to station, one of said stations being for the manual removal of the work and introduction of a new work-piece, and a multiple-drill head located at each of the other stations, and mechanism timed to feed said drill heads and drill the work during its intervals of rest.

11. A machine of the class described including in combination a machine having a plurality of stations located at intervals- -means for automatically rotating said bed intermittent-1y to bring all said plates simultaneously to successive stations, a multipledrill head with vertical spindles located above each station, means for feeding said heads down on the pieces of work while the bed is at rest, and a common motor for driving said bed-rotating means and said headfeeding means.

13. A, machine of the class described including in combination a horizontal bed, a number of work-holding plates on said bed arranged at intervals around the center,

means for automatically rotating said bed intermittently to bring all said plates simultaneously to successive stations, a multiple drill head. with vertical spindles located above each station, drill feeding means com prising a central driving gear and driven pinions for the respective heads arranged at intervals around it, and drill rotating means comprisinga central driving gear and driven pinions for the respective heads arranged at intervals around it.

14. A machine of the class described including in combination a horizontal bed, automatic means for rotating it intermittently about a central vertical axis, multiple-drill heads arranged at intervals about said axis above said bed, drill feeding means comprising a'central driving gear, pinions for the respective heads arranged at intervals about said driving gear and driven thereby, cams operated by said pinions, and stems extending upward from the heads and engaging said cams so as to be raised and lowered by the rotation thereof; and drill rotating means comprising a central driving gear, pinions for the respective heads arranged at intervals about said driving gear and driven thereby, each of said heads 'having a central driving shaft, and gears at the upper ends of saidshafts engaging said pinions and rotated thereby. v

15. A machine of the class described including in combination a horizontal bed, automatic means for rotating it intermittently about a central vertical axis, multiple-drill heads arranged at intervals about said axis above said bed and means for rotating said drills-and feeding said heads to and from the work, a central casing 1 by which said heads are guided, and couriterweights' for said heads carried in said casing.

16. A machine of the class described including in combination a horizontal bed, au-

tomatic means for rotating it intermittently drills and feeding said headsto and from the work, a central casing by which said heads are guided, and counterweights for said heads carried in said casing, a base carrying said rotatable bed, and an upper casing carrying gearing for said drill heads, said central casing being suspended from said upper casing.

17. A machine of the class described including in combination a rotary carrier, automatic means for'rotating it intermittently about a central axis, multiple-drill heads arranged at intervals about said axis and means for rotating said drills and periodically feeding said heads to and from the work, and hand operated means for slowly rotating said carrier. 7

18. A machine of the class described including in combination a rotary'carrier, automatic means for rotating it intermittently about a central axis, multiple-drill heads arranged at intervals about said axis and means for rotating said drills and periodically feeding said heads to and from the work, said "carrier-rotating means comprising a rotating crank, a Geneva .star wheel and ineans for shifting the relation between said star wheel and crank so that in one position the crank can rotate without eEect and in the other position the crank will engage and actuate the star wheel.

19. A machine of the class described including in combination a rotary carrier, means for rotating it intermittently about a central axis comprising a rotating crank and a Geneva star wheel, multiple-drill heads arranged at intervalsabout said axis and means for rotating said drills and periodically feeding said heads to and from the work, meansfor shifting the relative posi tion of said crank so that it can rotate without effect and hand operated means for.

slowly rotating said carrier.

In witness whereof, I have hereunto signed my name in the presence of two sub} scribing witnesses.

JAMES A. EDEN, J R.

Witnesses M; CANNELL, D. AnTHoNr USINA. 

